banana smile 

smiling without your teeth; also known as the pedophile smile

he was cute but he banana smiled at me so that just gave me a creepy vibe.

banana smile by hottestbetch August 22, 2011

Fresh banana smile 

The act of putting the freshly washed side shaft of one's penis between someone's lips from the side thus creating the fresh banana smile.

Jake turned Sally's frown upside down by giving her a fresh banana smile.

Fresh banana smile by Marquenta November 27, 2015